"In off the moors, down through the mist-bands God-cursed Grendel came greedily loping" (710-711).
Grendel entered the hall with bloodthirsty rage and saw many men sleeping. He was eager to devour them, "but his fate that night was due to change" (733-734). Little did he know that Beowulf was pretending to be asleep.
After consuming one of the men, Grendel raised a battle-claw to attack Beowulf. Suddenly, Beowulf seized the monster in a grip stronger than Grendel had ever encountered. He could not escape.
Grendel and Beowulf crashed through the hall, destroying everything in their path. Grendel's shriek was so powerful, fear struck all who heard it.
Beowulf would not allow Grendel to escape alive. Despite his warriors' best efforts, "they could have not known at the time, that not blade on earth, no blacksmith's art could ever damage their demon opponent" (800-802).
Although he could not be harmed by swords, Grendel's "going away out of the world and the days of his life would be agony to him, and his alien spirit would travel far into fiends' keeping" (804-807).